DING DING DING! I HAVE A GREAT IDEA!
I noticed that downsized players won't control a boat alone. For personal mini-boats, you could introduce lilly pad boats! You can craft them with a lilly pad and stick. They function like boats, except they can fit in 1x1 holes without chocking the player, but only downsized players can use them. It has a downside, however; It never breaks by hitting a block, but this is because it goes too slow to do so.
I found another small bug! I made a zombie giant, and an Iron Golem found it and started chasing it. However, it couldn't reach the zombie. Also, if a baby chicken is the smallest size possible, you will never see while you're normal.
I also noticed something cool about this mod! There used to be a Giant mob, which looked exactly like zombies. It nevers spawns naturally now. However, if you embiggen a zombie, it becomes a Giant mob! I found this when I was having fun messing around with other mobs' sizes, which is why I downloaded this mod in the first place. If you spawn an actual Giant in the game through mods, I do not recommend using the F key on it. Seriously, it might crash the game if the Giant is too big.
Suggestion: Add Glowstone as a variable for how big/small you can make the mobs and yourself!
AKA, for example, start with a normal shrinking potion. This shrinks you a little bit. Then, add glowstone and get a shrinking potion II. This shrinks you more. All the way down to a shrinking potion III/IV which makes you shrink the most! I hope you consider my suggestion! :DUgh.. Sorry for a triple post, but can you please remove the F/R key thing from survival? It just seems a little cheaty to me. But, your decision. Thanks.
I absolutely adore this mod! I've been wanting something like this for a while! ...the only problem is that it isn't compatible with my other favorite mods (smart moving and modloader/modloadermp) lol. Hope this gets patched
EDIT: Oh wow...not compatible with Faithful nor Sphax pureBDcraft texture pack :P....hehe....